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. 2020 May 12;19:101. doi: 10.1186/s12934-020-01361-w

Table 2.

Effect of carbon sources on γ-PGA production by B. siamensis SB1001 and mutant strain IR10

Carbon source 12 h 24 h Biomass (P value)
Biomass (g/L) γ-PGA (g/L) Biomass (g/L) γ-PGA (g/L)
SB1001 IR10 SB1001 IR10 SB1001 IR10 SB1001 IR10 SB1001 IR10
Glucose 2.31 ± 0.08 3.96 ± 0.12 1.37 ± 0.05 5.60 ± 0.23 4.49 ± 0.18 4.82 ± 0.21 2.77 ± 0.11 7.74 ± 0.35 1.76 × 10−6 2.44 × 10−6
Fructose 2.69 ± 0.07 4.25 ± 0.13 0.34 ± 0.01 4.99 ± 0.18 4.56 ± 0.17 4.86 ± 0.21 0.36 ± 0.02 7.21 ± 0.26 1.32 × 10−6 2.36 × 10−6
Sucrose 2.52 ± 0.08 4.71 ± 0.13 5.24 ± 0.23 5.70 ± 0.21 4.07 ± 0.14 6.22 ± 0.28 7.06 ± 0.26 7.14 ± 0.25 9.59 × 10−7 2.77 × 10−6
Glycerol 1.52 ± 0.05 2.99 ± 0.09 1.95 ± 0.06 3.23 ± 0.12 3.33 ± 0.14 6.67 ± 0.26 3.82 ± 0.15 6.81 ± 0.22 2.15 × 10−6 1.56 × 10−6
Maltose 2.58 ± 0.08 4.08 ± 0.11 0.33 ± 0.01 3.32 ± 0.11 4.36 ± 0.16 5.97 ± 0.23 0.55 ± 0.03 6.98 ± 0.22 1.24 × 10−6 1.49 × 10−6
Mannose 0.02 ± 0.01 4.18 ± 0.12 0 4.09 ± 0.15 0.02 ± 0.01 4.80 ± 0.21 0 7.11 ± 0.24 1 2.48 × 10−6
Xylose 1.35 ± 0.05 2.47 ± 0.06 0.31 ± 0.01 1.73 ± 0.05 4.36 ± 0.18 5.88 ± 0.22 0.64 ± 0.02 6.22 ± 0.18 1.98 × 10−6 1.33 × 10−6
Lactose 0.42 ± 0.02 4.46 ± 0.14 0 3.79 ± 0.14 1.38 ± 0.03 5.79 ± 0.20 0 7.09 ± 0.25 1.95 × 10−7 9.65 × 10−7
Galactose 0.18 ± 0.01 1.27 ± 0.13 0 0 0.51 ± 0.02 3.09 ± 0.15 0 0.72 ± 0.03 2.88 × 10−6 3.81 × 10−6

Initial biomass (0 h) 0.02 g/L; Statistical analysis was performed for the biomass at 0 h and 24 h. P-values < 0.05 showed the significant differences